Put in the same category as GNU bison.

lemon/lemon.spec

@@ -30,7 +30,7 @@ URL:          http://www.hwaci.com/sw/lemon/
 Vendor:       D. Richard Hipp
 Packager:     The OpenPKG Project
 Distribution: OpenPKG [EXP]
-Group:        Text
+Group:        Language
 License:      GPL
 Version:      1.0
 Release:      20020715